With a pinboard in the Backdrop dialog, using the centre option and an image large than the pinboard results in the image being rendered from its top-left corner. The correct behavior would seem to be to render such that the center of the image is displayed at the center of the pinboard. A patch is included to produce this behavior.

This bug has been marked as Fix Committed for over a year. If the fix has made it into Ubuntu, please mark this bug as Fix Released. If the fix has been released upstream, but not Ubuntu, create a new bug asking for the new version and tag it with upgrade-software-version. If this bug has not been fixed anywhere, change the status back to Confirmed.